Malicious PDF — malware analysis report

Static analysis result for SHA-256 982ce3ada3bf20c1…

MALICIOUS

PDF

90.3 KB Created: 2021-03-07 00:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 49e5c22e5d6cb7284852f8e5595026fd SHA-1: 884d7fcb1d882b857b8e3cebfeaf74522f82ada2 SHA-256: 982ce3ada3bf20c1699436f59b8babc83f4c5e59aeee62d7e9526983ee499605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://jumiwimov.ru/strik?utm_term=an+introduction+to+the+fractional+calculus+and+fractional+differential+equations+pdf, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=an+introduction+to+the+fractional+calculus+and+fractional+differential+equations+pdf PDF link annotation
    • http://zememor.sportsontheweb.net/81576612749.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/how_do_you_program_a_universal_remote_to_a_sanyo_tv.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/willy_wonka_and_the_chocolate_factory_characters_wiki.pdfIn PDF document text
    • http://douchehq.xyz/coleman_lantern_battery_pack_replacementncbcz.pdfIn PDF document text
    • http://copyrightsupporteds.com/57241369113zxj3u.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/34636947240.pdfIn PDF document text
    • http://shopyou.online/el_aula_diversificada_gratis8rgvf.pdfIn PDF document text
    • http://coolvdomaion.online/the_magicians_book_wikiah26ad.pdfIn PDF document text
    • http://igbusinessabouthelp.com/active_and_passive_voice_testshz7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cd0f35-ab1f-4d1a-bc45-0885c5e783ad/what_are_the_five_scrum_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7fc023-b886-40c8-aa77-35c13e06cab0/bojobetikisavafuvir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b992775a-795a-47d1-b982-598a6771afcf/panasonic_viera_remote_app_not_finding_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/nebobunepa.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/tivimupuferevij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e588a0b9-b017-4948-bdd4-95921bb447e2/how_can_you_tell_if_a_harry_potter_book_is_a_first_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/94759067284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c68c1e-d084-425c-9c8d-d5c60cd64d94/the_maze_runner_2_ending_scene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4800c023-07c7-4f25-94ce-fd85ac477376/tosifozovepekotanakebase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e933268a-6493-49ef-8f79-4e40101dd45c/what_are_the_four_elements_of_magical_realism.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/zend_avesta_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77f4e07-265c-483c-87a7-e85042a15ca2/a_long_walk_to_water_discussion_questions_by_chapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17ac50f-36a8-4f72-a00a-c6192d8bda58/sijurilavobimemixo.pdfIn PDF document text
    • http://litorow.myartsonline.com/46974766396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8c20b5-4202-4c05-a783-733e06b8b0c9/dikefizejatabonowozopu.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/battlefield_1942_steam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 5360 bytes
SHA-256: 703507984e66078fb782e02dd6eb73cd9cf39682ecfc0f13d829fdcce17e52ab
font_01_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 13936 bytes
SHA-256: 8235decba01ca53d1e01304dd6ba3fd87ecf74cb101ceede9a88225fbfe08e91